Sentence Case Converter

Convert text to sentence case online in one click — paste any paragraph and get clean, properly capitalized sentences instantly. Use the free Sentence Case Converter below — enter your values and get instant results, right in your browser. Logic: the first alphabetic character of the text and every character following a sentence-ending mark (. ! ?) plus a space is uppercased; all other letters are lowercased. Example: "hELLO. hOW ARE you?" becomes "Hello. How are you?"

How to use the Sentence Case Converter

Sentence case means only the first letter of each sentence is capitalized, with everything else in lowercase — the standard style for essays, reports, emails and blog posts. When you copy text from PDFs, chats or scanned documents it often arrives in ALL CAPS or with random capitalization, and fixing it by hand is slow. This tool converts text to sentence case online instantly, right in your browser, so your writing looks neat and professional without retyping a single word.

  1. Paste or type your text into the input box at the top of the tool.
  2. The Sentence button is selected by default — if not, click it in the operations row.
  3. Your converted text appears instantly in the output box below.
  4. Click Copy to copy the result, or Clear to start over with new text.
  5. Watch the live stats bar for word count, character count and estimated reading time.

Formula

Logic: the first alphabetic character of the text and every character following a sentence-ending mark (. ! ?) plus a space is uppercased; all other letters are lowercased. Example: "hELLO. hOW ARE you?" becomes "Hello. How are you?"

Worked example

Input: "tHE CAT sat ON the MAT. it WAS sunny." Click Sentence. Output: "The cat sat on the mat. It was sunny." The stats bar shows 10 words, 40 characters and about 3 seconds of reading time. Copy the clean result straight into your document.

Frequently asked questions

Sentence case capitalizes only the first letter of each sentence and proper nouns are handled as you typed them. It is the normal capitalization style for body text in English.

Title Case capitalizes every major word and is used for headings. Sentence case only capitalizes the start of each sentence, which is correct for paragraphs and emails.

No. The conversion happens entirely in your browser, so your text never leaves your device and nothing is stored.

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